Generate opam file and improve CONTRIBUTING.md (#659)

Author: aspeddro

CONTRIBUTING.md

@@ -25,8 +25,21 @@ Thanks for your interest. Below is an informal spec of how the plugin's server c
 ## Install Dependencies
 
 - Run `npm install` at the root. This will also install the npm modules for both the `client` and `server` folders.
-- `opam switch 4.14.0` (if you haven't created the switch, do it). OPAM [here](https://opam.ocaml.org). This is needed for the `analysis` folder, which is native code.
-- Optionally, you can `opam install ocamlformat` and format the `.ml` files in `analysis`.
+
+## Analysis Binary
+
+This is needed for the `analysis` folder, which is native code.
+
+```sh
+# If you haven't created the switch, do it. OPAM(https://opam.ocaml.org)
+opam switch 4.14.0 # can also create local switch with opam switch create . 4.14.0
+
+# Install dev dependencies from OPAM
+opam install . --deps-only
+
+# For IDE support, install the OCaml language server
+opam install ocaml-lsp-server
+```
 
 ## Build & Run
 

analysis/dune-project

@@ -1,5 +1,15 @@
 (lang dune 2.0)
 
+(generate_opam_files true)
+
+(authors "Cristiano Calcagno")
+
+(maintainers "Cristiano Calcagno")
+
+(homepage "https://github.com/rescript-lang/rescript-vscode")
+
+(bug_reports "https://github.com/rescript-lang/rescript-vscode/issues")
+
 (package
  (name rescript-vscode)
  (synopsis "ReScript vscode support")

analysis/rescript-vscode.opam

@@ -0,0 +1,27 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "ReScript vscode support"
+maintainer: ["Cristiano Calcagno"]
+authors: ["Cristiano Calcagno"]
+homepage: "https://github.com/rescript-lang/rescript-vscode"
+bug-reports: "https://github.com/rescript-lang/rescript-vscode/issues"
+depends: [
+  "ocaml" {>= "4.10"}
+  "ocamlformat" {= "0.22.4"}
+  "reanalyze" {= "2.23.0"}
+  "dune"
+]
+build: [
+  ["dune" "subst"] {pinned}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]